Basically this, I want to convert 9v dc to a 50hz pulse. And I need a very simple newbie circuit. If you have a tutorial, better. Ive searched all over the net but I cant seem to find one simple enough. The purpose is to connect its output to an old transformer to create some high voltage sparks. But the problem is that I cant get or make a flyback transformer. So please help teach me a simple circuit for this. All help appreciated.